Mozilla provides Linux packages for Firefox / Thunderbird, but many of users prefer using packages available with distro. As a result you need to wait until your favorite disto release latest rpm / deb or find alternative repo to get latest packages. Rather hunting you may start using TAR packages available at mozilla.
You can download TAR for Thunderbird from Mozilla.
Configure custom application launcher same as we did with Firefox.
Once you are using firefox / thunderbird from tar, you don’t need to wait for rpm / deb, rather you can upgrade from application itself.
Help –> Check for Updates

If there is minor release update, Updater will download few KB & you have latest thunderbird running. Also you don’t need to keep on checking using updater. Whenever new release is available updater will download it in background & will upgrade thunderbird on next restart.
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[...] you are using tar based package on linux or windows, all you need to do is to click on help => check for updates to get latest [...]
Easiest way to Install / Upgrade Thunderbird on Ubuntu / Fedora | LinuxReaders…
Mozilla provides Linux packages for Firefox / Thunderbird, but many of users prefer using packages available with distro. As a result you need to wait until…